It is simple, powerful, extensible and free. Most of all, it is pretty! Its main purpose is to rewrite the important SMF URLs, like these:

* http://domain.com/board/topic/* http://domain.com/profile/user/* http://domain.com/unreadreplies/Pretty URLs will work with SMF 1.1 and 2.0. It requires an Apache webserver with support for mod_rewrite and .htaccess files.